EP 3689852 A1 20200805 - METHOD FOR PRODUCING DIHYDROXYINDOLES
Title (en)
METHOD FOR PRODUCING DIHYDROXYINDOLES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON DIHYDROXYINDOLEN
Title (fr)
PROCÉDÉ DE PRODUCTION DE DIHYDROXYINDOLES
Publication
Application
Priority
- JP 2017212035 A 20171101
- JP 2018040457 W 20181031
Abstract (en)
A method for producing dihydroxyindoles includes: a step 1 of obtaining an aqueous first solution including DHIs obtained by causing DOPAs to react with hexacyanoferrate(III); a step 2 of obtaining an oleaginous second solution in which DHIs are extracted in an extraction solvent by mixing the first solution obtained in the step 1 with the extraction solvent; and a step 3 of obtaining an aqueous third solution by evaporating the extraction solvent from a mixture of the second solution obtained in the step 2 and water. The extraction of DHIs in the step 2 is performed in a tank A. After the second solution is discharged from the tank A, the second solution is supplied to a tank B, and then the step 3 is performed in the tank B.
IPC 8 full level
C07D 209/08 (2006.01); C07D 209/42 (2006.01)
CPC (source: EP US)
C07D 209/08 (2013.01 - EP US); C07D 209/42 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3689852 A1 20200805; EP 3689852 A4 20210609; EP 3689852 B1 20240529; BR 112020008674 A2 20201027; CN 111247124 A 20200605; CN 111247124 B 20231013; JP 7212628 B2 20230125; JP WO2019088151 A1 20201112; SG 11202003954Q A 20200528; TW 201927751 A 20190716; TW I762736 B 20220501; US 10947194 B2 20210316; US 2020339510 A1 20201029; WO 2019088151 A1 20190509
DOCDB simple family (application)
EP 18873734 A 20181031; BR 112020008674 A 20181031; CN 201880067413 A 20181031; JP 2018040457 W 20181031; JP 2019550443 A 20181031; SG 11202003954Q A 20181031; TW 107138499 A 20181031; US 201816760796 A 20181031